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Title:
PRESSURE CONTROL DEVICE IN OIL PUMP
Document Type and Number:
Japanese Patent JP2008223755
Kind Code:
A
Abstract:

To reduce friction while maintaining characteristics identical to pressure characteristics of a common oil pump based on provision of a plurality of discharge sources and a newly devised method of switching oil passages.

The device is configured from a first discharge passage 1 from a first rotor assembly A to an engine, a first return passage 2 that returns to an intake side of the first rotor assembly A, a second discharge passage 3 from a second rotor assembly B to the engine, a second return passage 4 that returns to an intake side of the second rotor assembly B, and a pressure control valve C whose valve main body is provided between a discharge port 30 from the second rotor assembly B and the first discharge passage 1. The first discharge passage 1 and the second discharge passage 2 are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first discharge passage 1 and the second discharge passage 3 are open; an intermediate revolution range in a state in which the first discharge passage 1 and second discharge passage 3 are open and the first return passage 2 is closed while the second return passage 4 is open; and a high revolution range in a state in which the second discharge passage 3 is closed while the first discharge passage 1 is open and the first return passage 2 and second return passage 4 are open.


Inventors:
Ono, Yasunori
Kai, Keiichi
Fujiki, Kenichi
Yamane, Kosuke
Application Number:
JP2007000237536
Publication Date:
September 25, 2008
Filing Date:
September 13, 2007
Export Citation:
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Assignee:
YAMADA SEISAKUSHO CO LTD
International Classes:
F04C14/26; F04C11/00; F04C15/06
Domestic Patent References:
JPH0633207A
Attorney, Agent or Firm:
岩堀 邦男